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a2a1c95c10
freebsd-dev/sys/i386/include
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Peter Wemm a2a1c95c10 The biggie: Get rid of the UPAGES from the top of the per-process address 
space. (!)

Have each process use the kernel stack and pcb in the kvm space.  Since
the stacks are at a different address, we cannot copy the stack at fork()
and allow the child to return up through the function call tree to return
to user mode - create a new execution context and have the new process
begin executing from cpu_switch() and go to user mode directly.
In theory this should speed up fork a bit.

Context switch the tss_esp0 pointer in the common tss.  This is a lot
simpler since than swithching the gdt[GPROC0_SEL].sd.sd_base pointer
to each process's tss since the esp0 pointer is a 32 bit pointer, and the
sd_base setting is split into three different bit sections at non-aligned
boundaries and requires a lot of twiddling to reset.

The 8K of memory at the top of the process space is now empty, and unmapped
(and unmappable, it's higher than VM_MAXUSER_ADDRESS).

Simplity the pmap code to manage process contexts, we no longer have to
double map the UPAGES, this simplifies and should measuably speed up fork().

The following parts came from John Dyson:

Set PG_G on the UPAGES that are now in kernel context, and invalidate
them when swapping them out.

Move the upages object (upobj) from the vmspace to the proc structure.

Now that the UPAGES (pcb and kernel stack) are out of user space, make
rfork(..RFMEM..) do what was intended by sharing the vmspace
entirely via reference counting rather than simply inheriting the mappings.
1997-04-07 07:16:06 +00:00
..
pc Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
_limits.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
ansi.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
apm_bios.h Sanitize APM a bit. Convert various #ifdef to id_flags instead. 1997-03-29 11:07:12 +00:00
apm_segments.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
asc_ioctl.h Cleaned up all headers that include <sys/ioctl.h> or <sys/ioccom.h>: 1996-09-21 14:59:43 +00:00
asm.h Moved userland assembler macros from <machine/asmacros.h> to 1997-03-09 13:57:33 +00:00
asmacros.h Moved userland assembler macros from <machine/asmacros.h> to 1997-03-09 13:57:33 +00:00
bootinfo.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
cdk.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
clock.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
comstats.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
conf.h Pass 3 of the great devsw changes 1995-12-08 11:19:42 +00:00
cons.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
console.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
cpu.h The biggie: Get rid of the UPAGES from the top of the per-process address 1997-04-07 07:16:06 +00:00
cpufunc.h Improved CPU identification and initialization routines. This 1997-03-22 18:54:54 +00:00
cputypes.h Improved CPU identification and initialization routines. This 1997-03-22 18:54:54 +00:00
cronyx.h Clean up Ethernet drivers: 1996-02-06 18:51:28 +00:00
db_machdep.h Backed out rev.1.5. if %cs is bad, %eip may be bad, but this is no longer 1997-03-28 12:46:52 +00:00
endian.h Don't try to lint the gcc extension byte-swapping macros. 1997-03-17 00:51:51 +00:00
exec.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
float.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
floatingpoint.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
frame.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
gsc.h Cleaned up all headers that include <sys/ioctl.h> or <sys/ioccom.h>: 1996-09-21 14:59:43 +00:00
ieeefp.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
in_cksum.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
ioctl_bt848.h PAL support: magic numbers moved into format_params structure. 1997-04-02 01:48:39 +00:00
ioctl_ctx.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
ioctl_fd.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
ioctl_meteor.h Cleaned up all headers that include <sys/ioctl.h> or <sys/ioccom.h>: 1996-09-21 14:59:43 +00:00
ipl.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
joystick.h Cleaned up all headers that include <sys/ioctl.h> or <sys/ioccom.h>: 1996-09-21 14:59:43 +00:00
limits.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
lpt.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
md_var.h Improved CPU identification and initialization routines. This 1997-03-22 18:54:54 +00:00
mouse.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
mtpr.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
npx.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
param.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
pcaudioio.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
pcb.h No longer use an i386tss as the basis of our pcb - it wasn't particularly 1997-04-07 06:45:18 +00:00
pcvt_ioctl.h Cleaned up all headers that include <sys/ioctl.h> or <sys/ioccom.h>: 1996-09-21 14:59:43 +00:00
perfmon.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
pmap.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
proc.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
profile.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
psl.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
ptrace.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
qcam.h Don't default to (wrong) SCO definitions for _IOR() etc. if <sys/ioctl.h> 1997-03-24 11:07:52 +00:00
random.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
reg.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
reloc.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
segments.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
si.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
signal.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
soundcard.h Bug fix for SNDCTL_DSP_GETOSPACE ioctl. It would report 0 bytes 1997-02-12 06:56:57 +00:00
speaker.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
specialreg.h Improved CPU identification and initialization routines. This 1997-03-22 18:54:54 +00:00
spigot.h Cleaned up all headers that include <sys/ioctl.h> or <sys/ioccom.h>: 1996-09-21 14:59:43 +00:00
spl.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
stdarg.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
sysarch.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
trap.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
tss.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
types.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
ultrasound.h Fix a bunch of spelling errors in the comment fields of 1996-01-30 23:02:38 +00:00
varargs.h Fixed the gcc ellipsis change to work with gcc-1.x. 1997-02-28 07:12:34 +00:00
vmparam.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00
wtio.h Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not 1997-02-22 09:48:43 +00:00